Series C IO Module in Honeywell DCS failure

H

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hatimnazir

In Honeywell DCS with 4 C300 Controller's and Series C IOM's. Recently a issue was faced that one IO Module which was Redundant Analog Output Module failed, and all the output went to initialization states. I/O module was then replaced but please help me out what can be the cause of the failure of the A/O module?
 
J
Assuming it isn't something like being baked to death in a panel because the panel's airconditioning failed for hours in a high ambient temperature (desert) environment, it could have been a latent ESD (Electrostatic discharge) event that weakened a semi conductor component during production.

Catastrophic damage would have been detected and remedied, but the device worked well enough to pass production tests and to operate in service for some period of time.

I'm sure there are forensic services that will take your PO and do an analysis on the corpse.

Luck of the draw rules in cards and life.
 
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